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Show 482 DR. G. LINDSAY JOHNSON O N T H E [June 5, chief varieties met with in this country, were examined by me with the same degree of luminosity and classed according to the shape of their pupils, as shown in the following table, in which I use the terms relating to shape in the sense hereinafter indicated and illustrated. I examined the animals twice over, first by day-light, and then by gas-light, the results on both occasions being the same. Tortoiseshell. Short-haired Oats (Males) Short-haired Oats (Females) Short-haired dark-blue and silver-grey tabbies.. Siamese Cats (Males) „ „ (Females)... Short-haired gelded KLiotntge-nhsa i(rteadbb iCeast)s (Males) Long-haired Cats (Females) Long-haired gelded Total Number examined. 30 33 14 4 o 25 7 22 29 14 180 Round. 20 17 13 3 0 19 4 16 15 4 111 Nearly round. 1 2 1 0 0 1 1 0 2 2 10 Round oval. 4 9 0 1 1 2 1 5 10 7 40 Pointed oval. 5 5 0 0 1 3 1 1 2 1 19 Fig. 1. I understand by :- Round-Practically a perfect circle. (Fig. 1, a). Nearly round or Obtuse round-The area common to two equal circles whose centres are separated by not more than a T T 6 part of their diameter, (b.) Round oval or Rectangular oval-The common area formed when the circles are separated by about g part of their diameter, (c.) Pointed oval or Acute oval-The common area formed when the centres of the circles are separated by \ or more than a quarter of their diameter, (d & e.) It will be seen by the above table that no general rule can be established as regards variety, with the exception perhaps of the blue tabbies, in which no oval pupils were observed. The colour of the iris seems to have no bearing whatsoever on the shape of the pupils. Sex likewise does not seem to be any guide, as the following summary of the above table shows :- |